I wouldn't use the 65 on anything bigger than a 30 gallon tank. The 125 on anything larger than a 50-60 gallon. And the 220 on anything larger than a 75 -90 gallon. These skimmers will work, but are absolutely on the low end. I just sold my CSS 65 that I used on my 16g bow. It required an inordinate amount of mods to get it working adequately.
Clam, those Coralifes I dont have one , but my guess is to stay away. I had one one order that was recommended by a very crappy LFS. Heard of Aquarium Adventure? Then I read all sorts of posts , people could not get it set right and what not, general complaints. I cancelled my order and went with an ASM. Man that baby kicks booty.